diff --git a/org.eclipse.xtend.ide/src/org/eclipse/xtend/ide/formatting/preferences/FormatterModifyDialog.java b/org.eclipse.xtend.ide/src/org/eclipse/xtend/ide/formatting/preferences/FormatterModifyDialog.java
index f65f12c2888..549532d577e 100644
--- a/org.eclipse.xtend.ide/src/org/eclipse/xtend/ide/formatting/preferences/FormatterModifyDialog.java
+++ b/org.eclipse.xtend.ide/src/org/eclipse/xtend/ide/formatting/preferences/FormatterModifyDialog.java
@@ -96,27 +96,11 @@ public FormatterModifyDialog(Shell parentShell, Profile profile, ProfileManager
 	// @Override intentionally removed to ensure backward compatibility
 	@SuppressWarnings({ "rawtypes", "unchecked" })
 	protected void addPages(final Map values) {
-		if (isOldAPIVersion()) {
-			try {
-				// use reflection to not break API
-				Method addTabPage = ModifyDialog.class.getDeclaredMethod("addTabPage", String.class, IModifyDialogTabPage.class);
-				//		addTabPage("Indentation", tabFactory.createIndentationTab(this, values));
-				addTabPage.invoke(this, "Braces", tabFactory.createBracesTab(this, values));
-				addTabPage.invoke(this, "White Space", tabFactory.createWhiteSpaceTab(this, values));
-				addTabPage.invoke(this, "Blank Lines", tabFactory.createBlankLinesTab(this, values));
-				addTabPage.invoke(this, "New Lines", tabFactory.createNewLineTab(this, values));
-				addTabPage.invoke(this, "Line Wrapping", tabFactory.createLineWrapTab(this, values));
-			} catch (NoSuchMethodException | SecurityException | IllegalAccessException | IllegalArgumentException
-					| InvocationTargetException e) {
-				XtendActivator.getInstance().getLog().log(new Status(IStatus.ERROR, XtendActivator.PLUGIN_ID, e.getMessage(), e));
-			}
-		} else {
-			addTabPageNewAPI("Braces", tabFactory.createBracesTab(this, values));
-			addTabPageNewAPI("White Space", tabFactory.createWhiteSpaceTab(this, values));
-			addTabPageNewAPI("Blank Lines", tabFactory.createBlankLinesTab(this, values));
-			addTabPageNewAPI("New Lines", tabFactory.createNewLineTab(this, values));
-			addTabPageNewAPI("Line Wrapping", tabFactory.createLineWrapTab(this, values));
-		}
+		addTabPageNewAPI("Braces", tabFactory.createBracesTab(this, values));
+		addTabPageNewAPI("White Space", tabFactory.createWhiteSpaceTab(this, values));
+		addTabPageNewAPI("Blank Lines", tabFactory.createBlankLinesTab(this, values));
+		addTabPageNewAPI("New Lines", tabFactory.createNewLineTab(this, values));
+		addTabPageNewAPI("Line Wrapping", tabFactory.createLineWrapTab(this, values));
 	}
 
 	// copied from Eclipse Oxygen to support old dialog in Eclipse Photon
@@ -131,10 +115,6 @@ private final void addTabPageNewAPI(String title, IModifyDialogTabPage tabPage)
 
 	@Override
 	public void create() {
-		if (isOldAPIVersion()) {
-			super.create();
-			return;
-		}
 		// copied from Eclipse Oxygen to support old dialog in Eclipse Photon
 		super.create();
 		int lastFocusNr = 0;
@@ -164,9 +144,6 @@ public void create() {
 	@Override
 	@SuppressWarnings("rawtypes")
 	protected Control createDialogArea(Composite parent) {
-		if (isOldAPIVersion()) {
-			return super.createDialogArea(parent);
-		}
 		try {
 			// copied from Eclipse Oxygen to support old dialog in Eclipse Photon
 			final Composite composite = new Composite(parent, SWT.NONE);
@@ -257,18 +234,4 @@ protected String getHelpContextId() {
 		return null;
 	}
 
-	/**
-	 * Check if the old (<= Eclipse Oxygen) API is used or not.
-	 * 
-	 * @return true if the Eclipse API is Eclipse Oxygen or older, true for Eclipse Photon or newer.
-	 */
-	private boolean isOldAPIVersion() {
-		try {
-			ModifyDialog.class.getDeclaredMethod("addPages", Map.class);
-			return true;
-		} catch (NoSuchMethodException | SecurityException e) {
-			return false;
-		}
-	}
-
 }
diff --git a/org.eclipse.xtext.util/src/org/eclipse/xtext/util/Exceptions.java b/org.eclipse.xtext.util/src/org/eclipse/xtext/util/Exceptions.java
index 8f91da81a5e..a1de0cf0a6d 100644
--- a/org.eclipse.xtext.util/src/org/eclipse/xtext/util/Exceptions.java
+++ b/org.eclipse.xtext.util/src/org/eclipse/xtext/util/Exceptions.java
@@ -34,7 +34,9 @@ public static <T> T throwUncheckedException(Throwable e) {
 	 * It is not available on JRE &lt; 1.7
 	 * 
 	 * @since 2.8
+	 * @deprecated addSuppressed method is exposed in JRE 1.8 and above.
 	 */
+	@Deprecated(forRemoval = true)
 	public static void addSuppressed(Throwable owner, Throwable add) {
 		try {
 			Method method = owner.getClass().getMethod("addSuppressed", Throwable.class);
diff --git a/org.eclipse.xtext/src/org/eclipse/xtext/formatting2/internal/ConflictingRegionsException.java b/org.eclipse.xtext/src/org/eclipse/xtext/formatting2/internal/ConflictingRegionsException.java
index 797f9b7f114..0cd59a7368f 100644
--- a/org.eclipse.xtext/src/org/eclipse/xtext/formatting2/internal/ConflictingRegionsException.java
+++ b/org.eclipse.xtext/src/org/eclipse/xtext/formatting2/internal/ConflictingRegionsException.java
@@ -30,7 +30,7 @@ public ConflictingRegionsException(String message, Throwable cause, Collection<R
 		super(message, cause);
 		this.traces = traces;
 		for (RegionTrace trace : traces)
-			Exceptions.addSuppressed(this, trace);
+			addSuppressed(trace);
 	}
 
 	@Override